/Engine/Source/Runtime/InteractiveToolsFramework/Public/BaseBehaviors/SingleClickOrDragBehavior.h
Internal function that forwards click evens to DragTarget::OnClickPress, you can customize behavior here
virtual void OnClickDragPressInternal ( const [FInputDeviceState](API\Runtime\InteractiveToolsFramework\FInputDeviceState) & Input, EInputCaptureSide Side )